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cpufreq / intel_pstate: Change to scale off of max P-state
Change to using max P-state instead of max turbo P-state. This change resolves two issues. On a quiet system intel_pstate can fail to respond to a load change. On CPU SKUs that have a limited number of P-states and no turbo range intel_pstate fails to select the highest available P-state. This change is suitable for stable v3.9+ References: https://bugzilla.kernel.org/show_bug.cgi?id=59481 Reported-and-tested-by: Arjan van de Ven <arjan@linux.intel.com> Reported-and-tested-by: dsmythies@telus.net Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Cc: 3.9+ <stable@vger.kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -103,10 +103,10 @@ struct pstate_adjust_policy {
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static struct pstate_adjust_policy default_policy = {
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.sample_rate_ms = 10,
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.deadband = 0,
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.setpoint = 109,
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.p_gain_pct = 17,
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.setpoint = 97,
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.p_gain_pct = 20,
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.d_gain_pct = 0,
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.i_gain_pct = 4,
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.i_gain_pct = 0,
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};
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struct perf_limits {
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@ -468,12 +468,12 @@ static inline void intel_pstate_set_sample_time(struct cpudata *cpu)
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static inline int intel_pstate_get_scaled_busy(struct cpudata *cpu)
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{
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int32_t busy_scaled;
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int32_t core_busy, turbo_pstate, current_pstate;
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int32_t core_busy, max_pstate, current_pstate;
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core_busy = int_tofp(cpu->samples[cpu->sample_ptr].core_pct_busy);
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turbo_pstate = int_tofp(cpu->pstate.turbo_pstate);
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max_pstate = int_tofp(cpu->pstate.max_pstate);
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current_pstate = int_tofp(cpu->pstate.current_pstate);
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busy_scaled = mul_fp(core_busy, div_fp(turbo_pstate, current_pstate));
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busy_scaled = mul_fp(core_busy, div_fp(max_pstate, current_pstate));
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return fp_toint(busy_scaled);
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}
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